Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Qual país marcou 66-68=134?
 ###Tabelas: CREATE TABLE affiliate_members (affiliate_members_id AUTO_INCREMENT PRIMARY KEY, Institution VARCHAR, Location VARCHAR, Founded INT, Type VARCHAR, Enrollment INT, Nickname VARCHAR, Current Conference VARCHAR, Pac-12 Sports VARCHAR) CREATE TABLE second_round (second_round_id AUTO_INCREMENT PRIMARY KEY, Place VARCHAR, Player VARCHAR, Country VARCHAR, Score VARCHAR, To par VARCHAR) CREATE TABLE "sandy_bridge_quad-core"_32_nm ("sandy_bridge_quad-core"_32_nm_id AUTO_INCREMENT PRIMARY KEY, Model number VARCHAR, sSpec number VARCHAR, Cores VARCHAR, Frequency VARCHAR, Turbo VARCHAR, L2 cache VARCHAR, L3 cache VARCHAR, GPU model VARCHAR, GPU frequency VARCHAR, Socket VARCHAR, I/O bus VARCHAR, Release date VARCHAR, Part number(s) VARCHAR, Release price ( USD ) VARCHAR) CREATE TABLE wta_tier_i_:19_finals_13_titles_6_runner-ups (wta_tier_i_:19_finals_13_titles_6_runner-ups_id AUTO_INCREMENT PRIMARY KEY, Outcome VARCHAR, Year INT, Championship VARCHAR, Surface VARCHAR, Partner VARCHAR, Opponents VARCHAR, Score VARCHAR) CREATE TABLE subdivisions (subdivisions_id AUTO_INCREMENT PRIMARY KEY, English Name VARCHAR, Simplified VARCHAR, Traditional VARCHAR, Pinyin VARCHAR, Area VARCHAR, Population INT, Density VARCHAR)  
SELECT Country FROM second_round WHERE Score = 66-68=134